theres 3 of these in one module. the attenuverting input channels (theres three on each mixer board, and 3 boards, so 9 inputs in total) are wired so that all 3 inputs on mixer 2 and mixer 3 are normalled … Continue reading →

you should probably build at least 2 of these. they accept positive or negative going sync pulses in any polarity or voltage between -12 and 12 volts and can extract a clean positive or negative trigger for the VCO’s. this … Continue reading →

Heres a damn fine module, that i had no part in designing. its an EFM module, designed by Tom Gamble back in 1999. i was lucky enough to buy a load of his PCBs back then and have enjoyed building … Continue reading →

heres the other VCO circuit ive been using recently. its an EFM design once again, but this time there are some changes from the original; ive got rid of the square wave and changed a cap and a resistor. heres … Continue reading →

heres some schematics for the comparators. type 1 is used for sync processing. feed any h or v sync signal in, patch the outputs to the sync input jacks on some vcos, and twiddle the knobs and flick the switch … Continue reading →

It runs from plus and minus 12 volts, and has a range of dc(ish) to over 100-200khz (as far as i can tell). it has a linearish cv response (within some ill defined and i suspect probably quite wierd limits … Continue reading →